JP2001336836A - Combustion equipment and combustion controlling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide combustion equipment and a combustion controlling method preventing the deterioration in the function of innocuous treatment of condensed water and a combustion function and enhancing safety. SOLUTION: This equipment is provided with a combustion means (a burner 6), a heat exchange means (a heat exchanger 24), a neutralizing means of condensed water (a neutralizing unit 60) and a detecting means (a thermocouple 76, a CO sensor 78, a wind pressure sensor 80 or a wind velocity sensor 81), and recovers sensible heat or latent heat from combustion exhaust gas(EG) to heat the fluid to be heated (feed water W and hot water Wh). The condensed water (D) generated by heat exchanger is neutralized by the use of neutralizer (62), and the deterioration in the exhausting function of an exhaust passage or an air supply function is detected. Then, the announcement of the deterioration in the exhausting function or the air supply function and the stop of combustion are performed so as to enhance safety.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a combustion apparatus and a combustion control method for detoxifying and discharging condensed water generated by recovery of sensible heat or latent heat of combustion exhaust gas.

[0002]

2. Description of the Related Art Conventionally, a heat exchanger for recovering sensible heat from combustion exhaust gas obtained by combustion of a fuel gas and a heat exchanger for recovering latent heat from the combustion exhaust gas are provided side by side, and a function of mainly recovering sensible heat or latent heat is provided. A heat exchanger that achieves high efficiency by sharing is put into practical use. In such a heat exchanger, a latent heat recovery type heat exchanger is installed on the downstream side of the combustion exhaust gas, and condensed water (drain) is generated by the heat exchange, and when components in the combustion exhaust gas dissolve into the condensed water. To produce a strongly acidic liquid such as nitric acid. If such liquid is disposed of naturally, there is a risk of causing environmental pollution. In order to avoid this, it is indispensable to provide a neutralizer and detoxify such as neutralization.

[0003]

In the detoxification process, that is, the neutralization process of the condensed water, a part of the exhaust passage is used as a collecting tray for the condensed water, and the collected condensed water is supplied from the exhaust passage to a pipe line. In this case, the water is used to lead to a neutralizer. Neutralization products accumulate in the neutralizer due to neutralization of the condensed water, and soot and dust in the combustion exhaust gas enter from the collection tray together with the condensed water. The exhaust passage is open to the outside air through the exhaust port, and it is expected that seeds and dust enter the neutralizer together with condensed water from the exhaust port. For this reason, there is a possibility that the neutralizer and its drain pipe may be closed, and the drain function of the drain may be reduced.

If the drainage function on the neutralizer side deteriorates, condensed water may overflow from the neutralizer and discard untreated condensed water. Further, when the exhaust passage has a U-shaped structure in order to prevent intrusion of dust and the like from the outside, condensed water overflowing from the neutralizer accumulates in the exhaust passage, closes the exhaust passage, and exhausts the exhaust passage. Function may be reduced. Deterioration of the exhaust function causes incomplete combustion and causes a decrease in the combustion function.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a combustion apparatus and a combustion control method in which the detoxification function of condensed water and the combustion function are prevented from deteriorating and safety is enhanced.

[0006]

The combustion apparatus and the combustion control method according to the present invention comprise a combustion means (burner 6), a heat exchange means (heat exchanger 24), a condensed water neutralization means (neutralizer 60) and Detecting means (thermocouple 76, CO sensor 78, wind pressure sensor 80
Or a wind speed sensor 81) for recovering sensible heat or latent heat from the combustion exhaust gas (EG) and heating the fluid (water supply W, hot water W
h), the condensed water (D) generated by the heat exchange is neutralized with a neutralizing agent (62), and a decrease in the exhaust function of the exhaust passage or a decrease in the air supply function is detected. The safety is enhanced by giving notice of a decrease or a decrease in the air supply function and stopping the combustion.

According to a first aspect of the present invention, there is provided a combustion apparatus for burning fuel, a burner (6), an exhaust passage (8) for flowing combustion exhaust generated by the combustion means to outside air, and an exhaust passage (8). Heat exchange means (heat exchanger 24) installed to recover sensible heat or latent heat from combustion exhaust and heat the fluid to be heated
A neutralizing means (neutralizer 60) for neutralizing the condensed water (D) generated by the heat exchange of the heat exchange means with a neutralizing agent (62); It is characterized by including detection means (thermocouple 76, CO sensor 78, wind pressure sensor 80 or wind speed sensor 81) for detecting.

That is, combustion of fuel produces combustion exhaust,
The heat exchange means recovers sensible heat or latent heat from the combustion exhaust gas to the fluid to be heated, and condensed water is generated by the heat recovery.
The condensed water is guided to a neutralizing means, neutralized by a neutralizing agent, and detoxified. In the neutralization process of the condensed water, if the drainage function is reduced, untreated condensed water overflows from the neutralization means and is discarded, which is inconvenient. Therefore, if the drainage function of the neutralizing means is detected indirectly or directly, the disposal of untreated condensed water can be prevented, and safety can be improved.

For example, when the water level of the condensed water rises due to the decrease in the drainage function of the neutralizing means, the condensed water overflows to the exhaust passage side, and when the exhaust function is reduced, the amount of combustion exhaust decreases, and the combustion means Insufficient combustion occurs due to insufficient combustion air. Therefore, the drainage function of the neutralizing means is indirectly detected from the state of the decrease in the amount of air, and based on the detection result, replacement of the neutralizing agent of the neutralizing means or replacement of the neutralizing means is urged. By doing so, safety can be improved.

According to a second aspect of the present invention, in the combustion apparatus, the detecting means is used for detecting a decrease in the air supply function of an air supply means (air supply fan 18) provided in the combustion means. And That is, when the air supply function is gradually reduced or cut off due to accumulation of soot or dust on the air supply means, disconnection, or the like, an output representing the output is obtained from the detection means. Or combustion can be stopped, and safety can be improved.

A third aspect of the present invention is directed to a combustion apparatus according to the present invention, wherein a temperature sensor (thermocouple 76) for detecting a flame temperature of the combustion means is used as the detection means.
That is, when the drainage function of the neutralizing means is reduced and condensed water does not flow to the neutralizing means, the condensed water accumulates in the exhaust passage,
The water level blocks the exhaust passage. Accordingly, when the amount of combustion air is insufficient, the combustion flame length retreats, so that the high-temperature portion at the boundary between the outer flame portion and the inner flame portion of the combustion flame descends and approaches a temperature sensor preset at that position. . If the temperature sensor detects a rise in temperature accompanying the lowering of the high-temperature portion of the combustion flame, it is possible to monitor an abnormality on the neutralization means side and a decrease in drainage function from the detected temperature. That is, when the detected temperature reaches the reference temperature, replacement or replenishment of the neutralizing agent, replacement of the neutralizing means can be prompted, or combustion can be stopped.

A combustion apparatus according to a fourth aspect of the present invention is characterized in that a CO sensor (78) for detecting CO or CO concentration in the combustion exhaust gas is used as the detection means. That is, when the drainage function of the neutralizing means is reduced and condensed water does not flow to the neutralizing means, the condensed water accumulates in the exhaust passage, and the water level lowers the exhaust function of the exhaust passage. If the amount of combustion air is insufficient, the amount of CO gas in the combustion exhaust gas increases. If this CO or CO concentration is detected by a CO sensor,
From the level of the detected output, it is possible to monitor an abnormality on the neutralization means side and a decrease in drainage function. That is, when the detected output reaches a predetermined level, replacement or replenishment of the neutralizing agent, replacement of the neutralizing means can be prompted, or combustion can be stopped.

According to a fifth aspect of the present invention, there is provided the combustion apparatus, wherein a wind pressure sensor (80) for detecting a wind pressure of the combustion exhaust gas is used as the detection means. That is, when the drainage function of the neutralizing means is reduced and condensed water does not flow to the neutralizing means, the condensed water accumulates in the exhaust passage, and the water level lowers the exhaust function of the exhaust passage. Therefore, if the wind pressure of the combustion exhaust gas is detected by the wind pressure sensor, it is possible to monitor the abnormality of the neutralizing means and the decrease of the drainage function from the level of the detected output. That is, when the detected output reaches a predetermined level, replacement or replenishment of the neutralizing agent, replacement of the neutralizing means can be prompted, or combustion can be stopped.

According to a sixth aspect of the present invention, in the combustion apparatus of the present invention, a wind speed sensor (81) for detecting a wind speed of the combustion exhaust gas is used as the detection means. In other words, when the condensed water accumulates in the exhaust passage due to a decrease in the function of the neutralizing means and the exhaust function of the exhaust passage is reduced by the water level, if the wind speed of the combustion exhaust is detected by a wind speed sensor, the level of the detected output is determined. It is possible to monitor abnormalities on the neutralization means side and a decrease in drainage function.

According to a seventh aspect of the present invention, there is provided a combustion control method comprising:
The fuel (fuel gas G) is burned by the combustion means (burner 6), and sensible heat or latent heat is recovered from the combustion exhaust gas (EG) to heat the fluid to be heated (supply water W, hot water Wh) and generated by heat exchange. Neutralizing means (neutralizer 6)
0, neutralization using a neutralizing agent 62), and the detection output such as the combustion flame temperature of the combustion means, the CO or CO concentration in the combustion exhaust gas, the wind pressure of the combustion exhaust gas, etc. is caused by the abnormality in the neutralization means side. When a level indicating a decrease in the exhaust function is reached and the level is maintained for a predetermined period of time, notification of the decrease in the exhaust function (display 98, sound generator 100, alarm 102) or stop of combustion of the combustion means (fuel Main valve 14, fan motor 10
4, igniter 20) is performed. That is, in this combustion control method, while condensed water generated by combustion of fuel and heat exchange is neutralized, a decrease in the drainage function is detected, and when the decrease in the drainage function continues for a predetermined time, the decrease in the drainage function is notified. Or stop combustion. Therefore, the notification can prompt the exchange or replenishment of the neutralizing agent, the exchange of the neutralizing means, or stop the combustion to prevent an unexpected misfire state and enhance the safety.

[0016] The combustion control method of the present invention according to claim 8 is characterized in that:
Detected outputs such as combustion flame temperature, CO or CO concentration in combustion exhaust gas, and wind pressure of the combustion exhaust gas reach a level indicating a decrease in the air supply function of the air supply means provided in the combustion means, and the level is maintained for a predetermined time. When the continuation is continued, the notification of the decrease in the air supply function or the stop of the combustion is performed. That is, the reduced function of the air supply means leads to incomplete combustion, in which case,
It appears in the temperature of the combustion flame, the generation or concentration of CO, the wind pressure or wind speed of the combustion exhaust, and the like. Therefore, when these detection outputs reach a level indicating a decrease in the air supply function, and the level continues for a predetermined time, it is notified or the combustion is stopped, whereby safety can be improved.

[0017]

FIG. 1 shows a hot water supply apparatus as an embodiment of a combustion apparatus according to the present invention. The casing 2 is provided with a combustion chamber 4 for burning the fuel gas G, and the combustion exhaust EG generated by the combustion of the burner 6 installed in the combustion chamber 4 flows through an exhaust passage 8 having a U-shaped structure. The air is discharged to the outside air from an exhaust port 10 formed on the side surface of the second. Fuel gas G is supplied to the burner 6 installed inside the combustion chamber 4 from below through a pipe 12, and the supply or stop of the supply is switched by a fuel supply valve 14, and the supply amount of the fuel gas G Is adjusted by the fuel proportional valve 16. The air required to burn this fuel gas G is
The air is supplied from an air supply fan 18 installed below the combustion chamber 4. In the vicinity of the burner 6, an igniter 20 is provided as an ignition means for igniting the fuel gas G.

A first heat exchanger 22 for mainly recovering sensible heat from the combustion exhaust gas EG is installed in the upper part of the combustion chamber 4, and the combustion exhaust gas EG passed through the heat exchanger 22 is disposed on the exhaust passage 8 side.
A second heat exchanger 24 mainly for recovering latent heat from the second heat exchanger 24 is provided. In the heat exchanger 22, a heat receiving tube 26 made of copper or a copper alloy is disposed in the combustion chamber 4, and heat absorbing fins 28 are formed around the heat receiving tube 26. The heat exchanger 24 is made of an acid-resistant metal such as titanium or a titanium alloy in order to prevent corrosion due to the strongly acidic condensed water D generated during latent heat recovery. In the embodiment, three heat receiving tubes 32, 34, and 36 formed of flexible pipes are bent and arranged. The heat exchangers 22 and 24 are connected in series via a line 38. The water W is supplied to the heat exchanger 24 through a pipe 40.
Is supplied, the hot water Wh obtained by the heat exchange of the heat exchanger 24 flows to the heat exchanger 22 through the pipe 38, and the high-temperature water HW obtained by the heat exchange is supplied through the pipe 42. A bypass pipe 44 is provided between the pipe 38 and the pipe 42 to join the hot water Wh to the high-temperature water HW on the pipe 42 side. The pipe 40 has a temperature sensor 46 and a pipe 4
2 are provided with temperature sensors 48 and 50, and a pipe 38 are provided with a water supply amount sensor 52. The temperature sensor 46 supplies water, the temperature sensor 48 supplies the temperature on the outlet side of the heat exchanger 22, and the temperature sensor 50 supplies hot water. The temperature is detected, and the water supply amount sensor 52 detects the water supply amount.

The exhaust passage 8 has a U-shaped structure provided with a partition wall 54 for allowing the combustion exhaust gas EG to pass through the heat exchanger 24. The bottom surface of the exhaust passage 8 has a funnel-shaped inclined surface for collecting condensed water D. To form a collection tray 56. The condensed water D collected in the collecting tray 56 is guided through a pipe 58 to a neutralizer 60 as a neutralizing means. Neutralizer 60
Is a closed container, in which a neutralizing agent 62 is filled, and a separation wall 64 for dividing the neutralizing agent 62 back and forth is provided to form two chambers 66 and 68. ing. Below the separation wall 64, a passage 70 through which the condensed water D flows is provided. Further, a drain pipe 72 is attached to the upper side wall of the neutralizer 60. That is, the condensed water D guided to the neutralizer 60 is neutralized by the neutralizing agent 62 in the chamber 66, then flows into the chamber 68, and is discharged from the chamber 68 through the drain pipe 72 to the outside. A filter 74 that allows only the condensed water D to pass therethrough is provided at the inlet of the drain pipe 72 to prevent the neutralizer 62 from flowing out.

As a detecting means for detecting a decrease in the function of the neutralizer 60, a thermocouple 76 which is a temperature sensor for detecting the temperature of the combustion flame F is provided. The thermocouple 76 generates an output representing the temperature of the combustion flame F, and the output level is proportional to the detected temperature. A CO sensor 7 for detecting CO or CO concentration in the combustion exhaust gas EG flowing through the exhaust passage 8 serves as a detecting means for indirectly detecting a decrease in the function of the neutralizer 60.
8. A wind pressure sensor 80 for detecting the wind pressure of the combustion exhaust EG and a wind speed sensor 81 for detecting the wind speed are provided.

In addition to the control system for controlling the fuel supply and the hot water supply, the control device of the hot water supply device is provided with a drainage function detecting section 82 as shown in FIG. Include a thermocouple 76, a CO sensor 78,
A wind pressure sensor 80 and a wind speed sensor 81 are provided. In this embodiment, the thermocouple 76, the CO sensor 78, the wind pressure sensor 80, and the wind speed sensor 81 are described as a means for detecting a decrease in the drainage function for convenience of explanation, but it is not necessary to install all of them. One or two or more may be selected and installed.

The detection output of the thermocouple 76, the CO sensor 78, the wind pressure sensor 80 or the wind speed sensor 81 is applied to an input / output device (I / O) 86 of a control unit 84 as control means. The control unit 84 is composed of a computer, and includes a CPU 88 that performs calculations and controls, a RAM 90 that temporarily stores calculation data, a ROM 92 that stores control programs and control data, a timer 94 that counts time, and the like.
These are linked by a data bus 96 or the like. And
The input / output device 86 includes a display 98 as a display unit for displaying a decrease in the drainage function or the stop of the combustion with characters or symbols, a sound generator 100 as a notification unit for notifying the decrease of the drainage function, the stop of the combustion, or the like by voice. In addition to the alarm device 102 as a notification means for notifying an abnormal state such as combustion stop by an alarm,
Fuel source valve 14, fan motor 104 of air supply fan 18,
The igniter 20 and the like are connected. When the combustion is stopped or the combustion is prohibited, the fuel supply valve 14 stops supplying the fuel gas G, the fan motor 104 stops rotating, and the igniter 20 stops the ignition operation.

Next, the combustion control of the combustion apparatus will be described. When feed water W is supplied through a pipe 40, the feed water W flows from the heat exchanger 24 to the heat exchanger 22. The fuel gas G is supplied to the burner 6 through the pipe 12 and is ignited by the igniter 20 to form the combustion exhaust EG together with the flame F. This combustion exhaust gas EG is discharged from the combustion chamber 4 through the exhaust passage 8 to the outside air from the exhaust port 10. In the heat exchanger 24, the latent heat from the combustion exhaust gas EG and the heat exchanger 2
In No. 2, sensible heat is mainly recovered from the combustion exhaust EG, and hot water Wh is generated in the pipe 38 and high-temperature water HW is generated in the pipe 42. The temperature of the high-temperature water HW is adjusted by the amount of heat added to the feed water W or the hot water Wh from the combustion amount obtained by controlling the opening of the fuel proportional valve 16.

The condensed water D generated on the heat exchanger 24 side by the heat exchange by the recovery of the latent heat is recovered by the recovery tray 56 and guided to the neutralizer 60, where the neutralization process, that is, the detoxification process is performed. Thereafter, the water is drained through a pipe 72.

For combustion of the burner 6, an appropriate amount of combustion air according to the number of the fuel gas G is supplied to the burner 6 by controlling the rotation of the air supply fan 18, but the filter of the air supply fan 18 is clogged or exhausted. When the required air amount decreases due to the decrease in the exhaust function of the passage 8, the number of rotations of the fan motor 104 is increased to replenish the insufficient air amount, and the replenishment often detects a decrease in the air amount. At times, the supply control of the fuel gas G is suppressed by adjusting the opening degree of the fuel proportional valve 16 (the number is reduced), and the combustion control for maintaining the optimal combustion is performed.

Incidentally, in the neutralization treatment of the condensed water D,
The condensed water D may be contaminated with components in the combustion exhaust gas EG or impurities due to dissolution of the metal forming the heat exchanger 24, the partition wall 54, the recovery tray 56, or the like, or may be contaminated with dust or the like from the outside.
Further, in the neutralizer 60, impurities due to compounding or the like may be precipitated in the neutralization process. Such impurities are neutralized by the neutralizer 6.
If the filter 74 stays at 0 and the filter 74 is closed, the drainage of the condensed water D is prevented, and the normal drainage function cannot be maintained. When such an abnormal state occurs, the neutralizer 60
, The condensed water D overflows and raises the water level of the recovery tray 56, and the rising water level narrows the effective cross section of the exhaust passage 8 and lowers the exhaust function of the combustion exhaust EG. The water level is
Reaches the lower end level SL of the condensed water D
To block the exhaust of the combustion exhaust gas EG. When such an unexpected situation occurs, the amount of air to the burner 6 becomes insufficient, causing incomplete combustion and causing misfire.

The relationship between the insufficient amount of air due to the decrease in the drainage function of the neutralizer 60 and the decrease in the air supply function of the air supply fan 18 and the output of the thermocouple 76 is shown in FIGS. Thus, the output of the thermocouple 76 changes. Characteristic A
Represents the output change based on the exhaust abnormality due to the abnormality of the drainage function on the neutralizer 60 side, and the characteristic B represents the output change based on the decrease of the air supply function on the air supply fan 18 side. That is, if the shortage of the air amount continues, the combustion flame length in the burner 6 recedes, and the high-temperature portion at the boundary between the outer flame portion and the inner flame portion of the combustion flame has a thermocouple 76 as a temperature sensor set in advance. As the combustion time t elapses, the level of the output voltage of the thermocouple 76 rises quadratically as shown by the characteristic A, whereas the filter on the air supply fan 18 side as shown by the characteristic B It rises very slowly due to accumulation of dust.

Therefore, as shown in FIG. 3, the output of the thermocouple 76 has a determination level V corresponding to the characteristic air supply abnormality.
₁ and the judgment level V corresponding to the deterioration of the drainage function of the characteristic A
₂ Set (> V ₁ ). When the output of the thermocouple 76 reaches the determination level V _1, the thermocouple below the determination level V ₁ 76
In order to shift (recover) the output, the number of rotations of the air supply fan 18 is increased to supplement the amount of air supply. In this case, the drainage function when lowered, to reach the danger determination level V ₂ of incomplete combustion due to the water level rise in the exhaust passage 8 at, for example, about 3 to 5 minutes time tn. That is, when the determination level V ₁ is reached, the rotation speed of the fan motor 104 is increased to recover to a level lower than the determination level V _1, but the supply amount is not recovered due to a decrease in the drainage function, and the recovery is continued. Then, the output of the thermocouple 76 rises. Then, to recognize the decrease in the exhaust functions by arrival determination level V _2, it is possible to determine the decrease in the reduction or exhaust functions of air supply functions.

Then, the output of the thermocouple 76 becomes the judgment level V
When it exceeds _1, the abnormality of the air supply fan 18 side, i.e., indicates that it entered the abnormal state representing a decrease in air supply function, immediately below the determination level V ₁ rpm is increased fan motor 104 Let it recover. This operation was also repeated n times regulating the combustion amount by the issue number down if it exceeds the determination level V ₁ is performed, when it exceeds the determination level V ₁ again, the display 98, the sound generator 100, alarm Vessel 102
If the combustion is stopped by notifying an alarm or the like, closing the fuel supply valve 14, prohibiting the start of the fan motor 104, prohibiting the ignition of the igniter 20, etc., an unexpected situation due to incomplete combustion can be avoided, and safety is improved. be able to. The determination of such a decrease in the sensor output and the drainage function can be similarly performed in the CO sensor 78, the wind pressure sensor 80, or the wind speed sensor 81.

Further, when the output of the fan motor 104 of the rotational speed increases by air charge thermocouple be replenished 76 is not shifted to the following determination level V ₂ is not the supply side of the problem, neutralizer An abnormality on the 60 side, that is, an abnormal state indicating a decrease in the exhaust function has been entered, and the notification, that is, a display by the display 98 and the sound generator 100, and the abnormal state continued for a predetermined time td. Accordingly, if combustion is stopped by notifying a warning or the like by the display 98, the sound generator 100, or the alarm 102, closing the fuel source valve 14, prohibiting the start of the fan motor 104, prohibiting the ignition of the igniter 20, and the like, An unexpected situation due to incomplete combustion can be avoided, and safety can be improved. The determination of such a decrease in the sensor output and the drainage function can be similarly performed in the CO sensor 78, the wind pressure sensor 80, or the wind speed sensor 81.

[0031] Therefore, when describing the combustion limit operation by draining function reduction neutralization 60 side with reference to a flowchart shown in FIG. 4, at step S1, whether or not the output of the thermocouple 76 exceeds the determination level V ₂ Is determined. Judgment level V
_If it exceeds ₂ , the process proceeds to step S2 and the time is measured. That is, the timer 94 is started, and in a step S3, it is determined whether or not a predetermined time td has elapsed. If the predetermined time td has not elapsed, the process returns to step S1, and
Again, it is determined whether or not the output of the thermocouple 76 exceeds the determination level V _2. If no output exceeds the determination level V _2, clearing the time measurement of the timer 94 shifts to step S4, it is returned to the initial value.

When the time when the output exceeds the judgment level V ₂ has passed a predetermined time td, the function of the neutralizer 60 is reduced,
That is, it is determined that the exhaust passage 8 is in an abnormal state in which the exhaust passage 8 is blocked by the condensed water D, and the process proceeds to step S5 to notify the abnormal state. For example, the abnormal state is visually displayed on the display 98 by characters, symbols, figures, or the like, and at the same time, the abnormal state is notified by sound from the sound generator 100, and the occurrence of the abnormal state is notified by an alarm 102 such as a buzzer. Warning.
That is, replacement of the neutralizer 60 and repair of the failure are urged.

Then, in step S6, the combustion is stopped. To stop the combustion, the fuel source valve 14 is closed, the fan motor 104 is stopped, and ignition of the igniter 20 is prohibited to prevent re-ignition.

In the case of a warning or notification based on the deterioration of the function of the neutralizer 60, the display 98 or the sound generator 100 is used.
For example, a message such as "Emergency stop due to blockage of neutralizer. Please contact service to replace neutralizer" is displayed, and a code for recognizing neutralizer replacement on display 98 is displayed. May be.

In the embodiment, the function decrease or the function stop of the neutralizer 60 is indirectly detected. However, according to the present invention, a water level sensor is installed on the collection tray 56 to monitor the water level, or This includes indirectly or directly monitoring the deterioration of the function or an abnormal situation, such as by electrically detecting a change in the neutralization function of the neutralizer 60, using various sensors or the like.

[0036]

As described above, according to the present invention,
The following effects are obtained. a Directly or indirectly detecting the drainage function of the neutralization means,
Since the neutralizing agent of the neutralizing means and the neutralizer can be replaced based on the detection, the disposal of untreated condensed water can be prevented, and safety can be improved. b Since the drainage function of the neutralizing means is indirectly detected from the reduced air amount, the detection can prompt the exchange of the neutralizing agent of the neutralizing means and the exchange of the neutralizer. c Due to the retreat of the combustion flame length due to the shortage of combustion air, a high-temperature portion at the boundary between the outer flame portion and the inner flame portion of the combustion flame can be detected by the temperature sensor. It is possible to monitor abnormalities in the water and deterioration of the drainage function. d. Condensed water accumulates in the exhaust passage, and when the exhaust level of the exhaust passage is reduced due to the water level and the amount of combustion air is insufficient, the amount of CO gas in the combustion exhaust increases. It is possible to monitor abnormalities in the water and deterioration of the drainage function. e Condensed water accumulates in the exhaust passage, and the water level of the exhaust passage reduces the exhaust function of the exhaust passage. If the wind pressure of the combustion exhaust is detected by a wind pressure sensor, an abnormality on the neutralizing means side and a decrease in the drainage function are detected from the detected output. Can be monitored. f Condensed water accumulates in the exhaust passage, and the water level of the exhaust passage reduces the exhaust function of the exhaust passage. If the wind speed of the combustion exhaust is detected by a wind speed sensor, the detected output can be used to detect abnormalities on the neutralizing means side and decrease in the drainage function. Can be monitored. g When the decrease in the drainage function continues for a predetermined time, the decrease in the drainage function is notified or the combustion is stopped, so that the notification prompts the exchange or replenishment of the neutralizing agent, the exchange of the neutralizer, or the stop of the combustion. By doing so, an unexpected misfire condition can be prevented and safety can be increased. h When the deterioration of the air supply function continues for a predetermined time, the deterioration of the air supply function is notified or the combustion is stopped.Therefore, the notification urges the repair of the air supply fan, etc., or stops the combustion, resulting in an unexpected misfire. The situation can be prevented and the safety can be increased.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of a combustion device and a combustion control method of the present invention.

FIG. 2 is a block diagram illustrating an embodiment of a control device.

FIG. 3 is a graph showing a transition of an output voltage of a thermocouple corresponding to a decrease in a drainage function or an air supply function.

FIG. 4 is a flowchart showing combustion control according to the present invention.

[Explanation of symbols]

 Reference Signs List 6 burner (combustion means) 8 exhaust passage 14 fuel supply valve 18 air supply fan (air supply means) 20 igniter 24 heat exchanger (heat exchange means) 60 neutralizer (neutralization means) 62 neutralizer 76 thermocouple (Detection means) 78 CO sensor (detection means) 80 Wind pressure sensor (detection means) 81 Wind speed sensor (detection means) 98 Display 100 Sound generator 102 Alarm 104 Fan motor D Condensed water F Combustion flame EG Combustion exhaust W Water supply ( Fluid to be heated) Wh Hot water (fluid to be heated)

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tetsuji Morita Osaka Gas Co., Ltd. 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi Inside Takagi Industry Co., Ltd. (72) Inventor Hiroshi Ichikawa 201 Nishi-Kashiwara Nitta, Fuji City, Shizuoka Prefecture Inside Takagi Industry Co., Ltd. (72) Yuji Sano 201 Nishi-Kashiwara Nitta, Fuji City, Shizuoka Prefecture Takagi Industry (72) Inventor Naoki Ishii 201 Nishi-Kashiwara Nitta, Fuji City, Shizuoka Prefecture Inside Takagi Industry Co., Ltd. (72) Inventor Naoki Kageyama 201 Nishi-Kashiwara Nitta 201, Fuji City, Shizuoka Prefecture Takagi Industry Co., Ltd. 72) Inventor Nobuyoshi Mitsui 201 Nishi-Kashiwara Nitta, Fuji City, Shizuoka Prefecture Inside Takagi Industry Co., Ltd.

Claims (8)

[Claims] 1. A combustion means for burning fuel, an exhaust passage through which combustion exhaust gas generated by the combustion means flows to the outside air, and a sensible heat or latent heat is recovered from the combustion exhaust gas and installed in the exhaust passage, and a fluid to be heated is provided. Heat exchange means for heating the heat exchange means, neutralizing means for neutralizing condensed water generated by the heat exchange of the heat exchange means using a neutralizing agent, detection means for detecting a decrease in the exhaust function of the exhaust passage, A combustion device comprising: 2. A combustion apparatus according to claim 1, wherein said detection means is used for detecting a decrease in an air supply function of an air supply means provided in said combustion means. 3. A combustion apparatus according to claim 1, wherein a temperature sensor for detecting a flame temperature of said combustion means is used as said detection means. 4. The combustion apparatus according to claim 1, wherein a CO sensor for detecting CO or CO concentration in the combustion exhaust gas is used as the detection means. 5. The combustion apparatus according to claim 1, wherein a wind pressure sensor for detecting a wind pressure of the combustion exhaust gas is used as the detection means. 6. The combustion apparatus according to claim 1, wherein a wind speed sensor for detecting a wind speed of the combustion exhaust gas is used as the detection means. 7. A fuel is burned by a combustion means, sensible heat or latent heat is recovered from the combustion exhaust gas to heat a fluid to be heated, and condensed water generated by heat exchange is neutralized by a neutralization means, The detection output of the combustion flame temperature of the combustion means, the CO or CO concentration in the combustion exhaust gas, the wind pressure of the combustion exhaust gas reaches a level indicating a decrease in the exhaust function due to an abnormality on the neutralization means side, and the level is reduced. A combustion control method comprising: notifying a decrease in the exhaust function or stopping the combustion of the combustion means when a predetermined time has elapsed. 8. Combustion flame temperature, CO or C in combustion exhaust gas
When the detection output such as the O concentration and the wind pressure of the combustion exhaust reaches a level indicating a decrease in the air supply function of the air supply means provided in the combustion means, and when the level continues for a predetermined time, the decrease in the air supply function is reduced. A combustion control method characterized by performing notification of combustion or stopping combustion.